Milling cutter



R. P. DEWEY Dec. 17, 1929.

Filed oct. s1,

Patented Dee 17, 1929 1,739,667

vUNITED STATES PATENT ori-ICE RITCHIE DEWEY, lOF ROCKFORD, ILLINOIS, ASSIGNOR TO BARBER-COLMAN COMPMANY, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS 'i MmLmG'CUTTER Application filed Octo'ber 31, 1925. Serial No. 65,962.

This invention relates to milling cutters of there is formedl a mounting bore 7 provided the integral type as distinguished from cut- With a keyway 8. ters of the inserted toothtype. The periphery of the cutter in the present The primary object of the invention is to instance has two sets of teeth which are 6 produce a spirally gashed cutter having a formed so that they are staggered about the 55 maximum number of teeth in the periphery periphery and so that they overlap and interbecause of a staggered relation' of intermeshmesh in order to provide a maximum number ing angularly disposed teeth, a large number of teeth. The teeth are formed and defined of teeth being desirableto increase the eiiiby gashes cut in the milling body and the 10 ciency of the cutter and to insure that the form and arrangement of the teeth are there- 60 cutter operates to impart a smooth finish to fore dependent upon the form and arrangethe work, and to insure a'great productive cament of the gashes. In the present instance pacity and a long life for the tool. V A a rounded gash is used to form a tapering Another object is to provide a cutter which tooth body, an'd the ratio of the width of can be readily milled from a blank' to form a the gashes to the spaceV between parallel ad- 05 unitary integral cutter, jacent gashes isless than unity to cause over- A still further object is to provide'a roundlapping ofv the teeth. Two sets ofgashes ed spiral clearance gash across the periphery are provided in all respects similar but inereof the cutter in one direction which intercepts 'ly reversed in direction. It is also desirable 2o the faces of the cutter atl points which are that the two sets have a definite arrange- 70 common to another set of similarly spiralled ment with respect to each other and for this gashes' extending in vthe other direction, purpose the intersections of the gashes of the whereby to form by the rounded gashes a two sets are made to fall at the side faces of y substantial support 'for the body of each the cutter. tooth. v In the cutter of the drawings two sets of 75] In the drawings there is shownan exemgashes are represented by the numerals 9 plary embodiment of the invention inwhich and 10,-the gashes intersecting at '11 in the not only the periphery of the cutter but also plane of the side faces of the cutter. Thus, the side faces ofthe cutter have cutting edges. any two gashes 9 and 10 define a tooth 12 3o In the drawings, Figure 1 shows a pertherebetween which has an annular cutting 3o f speetive view of a cutter embodying the ln- `fzicehl?) and a cutting edge 14 spiral in form. ven ion. ac ash is made rounded so that round Val- Fig- 2 iS a POIOH 0f a rectified elevaleys 1g5 are formed, in'this manner impartton of the periphery of the outtol'- ing to each tooth a firmintegral relation with Fig- 3 is a .Partia1-cr9ss Section 'on the, the mill body of such a character that 'each r otglo of F1g 2 Showmgthe Contourof tooth tapers outwardly therefrom. Thus the be is not limited to the orm isc ose an a so *D that certain changes and modifications'may zvn1h-gle-Iaorjut tapledf OI'In) tto the 9o be made in the arrangement of the parts of o m2 ldlpn 01 'Shaperfl olrln e Wlin the cutter withoutin any Way departing from e ,lm @n reargas .es .ul e toot. 1S the Spirit and Scope of the invention as eX provied in all directions wit a sufficient Pressed in the appended clam A material to give 1t a firm support `from the In thedrawings there is shown a cutter body Portlon of'tho outtoff 95 After formation of the 'teeth by cutting l in the forni of a disk suitable for cutting y grooves or channels, therebeing teeth on the the gashosa the body of each tooth 1S Sultably side faces aswell as on the periphery of the y n lOdified in Order to produce an efficient cutcutter. The cutter has in the present instance tlng body. The 90p 1S relleved as Shown at a web body 5 and a hub portion' in which 17 and the rear ofthe tooth is removed slantl ingly as shown at 18 to provide for chip clearance.

The teeth are formed in intermeshing relation so that they will overlap in their cutting range, each tooth extending from one face beyond the middle of the peripheral face.y This is accomplished by providing gashes, the Width of which on the periphery of the cutter is less than the space between adjacent parallel gashes. Only a slight initial overlapping of the teeth is required, because as the teeth are later sharpened by grinding,r away the edge 14 at the face 17, the teeth are shortened radially and become wider becauseof the sloping edge 16. Thus the overlapping of the teeth increases as the cutter is used.

In the present instance the teeth so formed are triangular in shape and lie adjacent the side faces of the cutter. When desired, side cutting edges 19 may be formed by cutting back each tooth as shown at 20 and by forming a 'cutting relief 21.

The cutter which has been above described is of simple construction adapted for economic manufacture as an integral cutter. In making such a cutter, a blank is milled with one set of spiral gashes all the way around. The Work blank is then re'set in the machine and the opposite spiral gashes are cut. In cutting the second set, the cutting tool passes through portions of the blank already cut in the first operation, these portions being common to the two sets of spiral gashes, or, in other words, common to two converging gashes. The tool is thus generally formed by two milling operations after which it is only necessary that the tops of the teeth be completed and the teeth on the side face formed when desired.

I claim as my invention:

1. An integral disk cutter comprising, in combination, a cutter body, and a 'plurality of cutting teeth on the periphery of said body, said teeth being arranged in two sets at opposite side faces -of the body, With the teeth o f one set staggered'wit-h respect to the teeth of the other set about the periphery, and with the teeth of the two sets overlapping in their cutting range, the teeth of each set being peripherally alined, each tooth. having a cutting edge which is substantially spiral in form, the forward portion of one tooth being laterally adjacent the rear portion of the next forward tooth, each tooth being formed between similar spiral gashes having opposite directions, and each set of tooth-forming gashes intersecting at a side- A face of the cutter.

2. An integral disk cutter comprising, in

combination, a disk body, and a plurality of extending from one side-face of the cutter to a point beyond the center of the peripheral face of the cutter, the cutting edge of each tooth being substantially spiral in form whereby the front portion of one tooth and the rear portion of the advance tooth of the other set are laterally adjacent on the peripheral face, there being formed spiral gashes at the front and rear of each tooth, said gashes being similar in forni but reverse in direction, and said gashes intersecting at a common point in the side-face'of the disk.

3. An integral'cutter comprising, in combinatipn, a body, said body being formed in its periphery with longitudinally inclined gashes, alternate gashes being inclined in epposite directions and intersecting in the side faces of said body so as to form a zigzag space about said body, the inner ends of'said gashes being rounded so as to form a slanting edge at each intersection, said gashes defining two sets of similar triangularly shaped teeth at opposite side faces of said body with the inner pointed ends of the teeth in staggered and overlapping relation.

In testimony whereof, I have hereunto affixed my signature.

RITCHIE P. DEVVE'Y. c 

